Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6f5e4a1b39b89fde33f2b8153ba36f2e04898270d714ebc4fbe3395c484ea1' 
  AND token = 'QuFXLi6kmtfXMoQuwmaYfKx+9jpna0bBnhD46OH3+qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}